How soon after initiating oral anticoagulation therapy for atrial fibrillation can it be interrupted for surgery or procedures?  

As with most things medical, multiple answers. If a patient walks into my office for preOp "clearance" and behold, they are in atrial fib, but asymptomatic, then it would depend on the urgency of their surgery. If elective, then you have time to work up his atrial fib and look for a reversal cause (...